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      • 자유도 저감법을 이용한 자동차 배기시스템 벨로우즈의 진동해석

        김정훈(Jeong Hoon Kim), 고석훈(Seok Hoon Ko), 김경훈(Kyung Hoon Kim), 김대열(Dae Youl Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

        The focus of this study is modeling technique for a bellows in vehicle exhaust system. Bellows was developed using the finite element model by replacing with the equivalent beam. The equivalent beam model was studied in detail. Non-structural node in the cross section of original model is given to expressing their motion. Equivalent mass matrix and stiffness matrices were calculated using guyan reduction method. Material properties of beam were obtained from the direct comparison between equivalent model and timoshenko beam model. The calculated natural frequencies and mode shapes are compared with the reference results and coincided well. This study can be applied on calculation of natural frequency of exhaust system and pipe system.

      • KCI등재

        인천지역 직업성 질환 감시체계 운용 11년간의 결과 및 특성

        김정훈(Jeong-Hoon Kim), 박신구(Shin-Goo Park), 임종한(Jong-Han Leem), 원종욱(Jong Uk Won), 한상환(Sang-Hwan Han), 정수영(Soo-Young Chung), 김상훈(Sang-Hoon Kim), 김환철(Hwan-Cheol Kim), 홍윤철(Yun-Chul Hong), 김철우(Cheol-Woo Kim), 김창환(Chan) 대한직업환경의학회 2010 대한직업환경의학회지 Vol.22 No.3

        목적: 인천 지역 직업성 질환 감시체계의 1998년부터 2008년까지의 11년간의 자료를 종합 분석하여 장기적 관점에서의 인천 지역의 직업성 질환의 발생현황과 규모를 파악하고 감시체계의 성과 및 발전과제를 연구하고자 한다. 방법: 인천지역 근로자들을 대상으로 매년 직업성 질환 감시를 시행하였으며 직업성 근골격계, 피부, 신경계, 간, 폐, 암 등의 질환을 웹사이트에 등록 하였으며 2008 년까지의 11년간의 직업성 질환 등록 자료를 바탕으로 감시 질환의 분포 및 특성을 기술하였다. 결과: 연구기간 중 총 1577건이 보고되었으며 직업성 근골격계질환이 1043건(66.1%)으로 가장 많이 보고되었고 직업성 천식이 172건(10.9%), 직업성피부질환이 162건(10.3%), 직업성 암이 135건(8.6%), 직업성 간질환 30건(1.9%), 진폐증 27건(1.7%), 직업성 신경계 질환이 8건(0.5%) 보고되었다. 결론: 인천지역은 대기업보다는 다양한 중소기업이 사업체의 대부분(99%)을 차지하고 있으며 전국과 인천의 사업 분류 구성비가 유사하며 직업병 통계에서 산재보상 자료이외에 뚜렷한 자료가 없는 현실에서 인천지역 직업성 질환의 발생 추이는 중소기업을 중심으로 한 전국의 직업성 질환 발생 추이를 추정하는데 좋은 기초 자료가 될 수 있을 것으로 판단된다. 10년간 수집된 인천지역감 시체계 자료를 바탕으로 향후 국내의 직업성 질환의 유병률 및 특성을 추정하고, 직업성 질환을 예방하는데 유용하게 사용할 수 있는 방안을 모색해야 하며 이를 위해서는 지속적인 지역 감시체계의 운용 및 확대가 필요할 것으로 사료된다. Objectives: Between Jan 1998 and Dec 2008, area-based occupational disease surveillance in Incheon was used to collect data on occupational diseases. The long-term data was used to estimate the scale of disease, to analyze disease characteristics, and to achieve surveillance in order to determine development tasks. Methods: For a period of 11 years, occupation-related disease surveillance was performed on an annual basis for employees of Incheon industries. All cases of occupational disease were reported by means of the Incheon Occupational Disease Information Network (IODIN) web site, downloaded, and analyzed, subsequently. Results: Between Jan 1998 and Dec 2008, 1577 cases of occupational disease were reported. Of these, there were 1043(66.1%) cases of occupational musculoskeletal disorders, 172(10.9%) cases of occupational asthma, 162(10.3%) cases of occupational dermatoses, 135(8.6%) cases of occupationally-related cancers, 30(1.9%) cases of pneumoconiosis, 27(1.7%) cases of toxic hepatitis, and 8(0.5%) cases of occupational neuronal disease. Conclusion: In the Incheon area, small and medium industries comprise 99% of business. The composition of the industry by category, in Incheon, is similar to the country on the whole. In actually, the data on occupational diseases in Korea are almost workers'compensation data. Thus, the survey of occupational disease based in Incheon, Korea, can serve as an estimate of the trends and size of the occupational disease throughout the entire country.

      • DSP를 이용한 Synchronous Buck Converter의 병렬 제어

        김정훈(Jeong-Hoon Kim), 임정규(Jeong-Gyu Lim), 신휘범(Hwi-Beom Shin), 정세교(Se-Kyo Chung), 이현우(Hyun-Woo Lee) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-

        This paper represents a digital parallel control of a synchronous buck converter using a digital signal processor (DSP). The digital PWM and load sharing controller is implemented in the DSP TMS320F2812 and the experimental results are provided to show the feasibility of the digital synchronous buck regulator.

      • 노이즈 변화에 따른 전산화단층촬영장치의 팬텀성능 평가

        김정훈(Jeong Hoon Kim), 김선기(Sun Ki Kim), 조현종(Hyeon Jong Cho), 하동윤(Dong Yoon Ha) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        Purpose The image quality relies on how it can clearly and correctly present the fine structure of human body into the image and the factors influencing on the quality of CT image are accuracy of CT number, noise, spatial resolution and contrast resolution, artifact, dosimetry and accuracy of device. Among these factors, this paper finds out the change of CT number, spatial resolution, contrast resolution, linearity of CT number, etc. followed by the noise change which is the standard deviation of CT number. Materials and Methods As for CT device, Light speed CT/I/pro of GE medical company was used for the CT device of this experiment. CT phantom used in this experiment is the Nuclear Associates CT for CT performance evaluation designed by the American Association of Physicists in Medicine (AAPM) and manufactured by Victoreen, and it is used for CT performance evaluation in Korea. For the method of experiment, the size of noise in CT Phantom was changed into 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18 and 20 and its change was compared and recorded by measuring CT number, high contrast spatial resolution, low contrast spatial solution, linearity of CT number, etc. for 4 times. The size of noise was changed with slice thickness, reformative algorithm, kVp, dosimetry, etc. Results 1. CT numb.er CT number in the change of noise changed from 0 to 0.9HU with the noise change from 1 to 10 and changed about -3HU with the noise change from 12 to 20. 2. High contrast resolution The high contrast resolution in the change of noise changed from 0.75 to 1mm with the noise change from 1 to 8 and decreased to 1.25mm with the noise change from 9 to 20. 3. Low contrast resolution The low contrast resolution in the change of noise changed from 3.2 to 6.4mm with the noise change from 1 to 4 and changed from 19. 5 to 25. 4mm with the noise change from 7 to 10. However, the low contrast resolution changed a lot above the scale of measuring Phantom with the noise change up to 12-20. 4. Linearity of CT number The linearity of CT number in the change of noise uniformly showed the change of CT number such as water, acrylic, nylon, polystyrene, polyethylene and lexan which are used for the linearity within the permitted limit with the noise change from 1 to 10, however, CT number rapidly fell down with the noise change from 12 to 20. Conclusion In the CT performance evaluation from the noise change, the result shows that CT. number, high contrast resolution and linearity of CT number maintained their performance recommended by Korean Institute for Accreditation of Medical Image within the permitted limit of noise but low contrast resolution ran off the permitted limit of noise in the noise with over 7. In the experiment, the result does not satisfy the current condition which has the accepTable standard easier than the company's regulation. Therefore, it is necessary to suggest the performance evaluation list and criteria satisfying the condition used in the real examination for the patients.

      • KCI등재

        코즈마케팅 사례별 전략유형 연구

        김정훈 ( Kim Jeong Hoon ) 한국상품문화디자인학회(구 한국패키지디자인학회) 2021 상품문화디자인학연구 Vol.64 No.-

        윤리적 소비가 사회현상으로 확대되면서 기업의 사회적 책임과 윤리경영이 더욱 강조되고 있다. 기업은 이러한 사회적 요구 수용과 함께 사익을 수반할 수 있는 새로운 대응전략을 필요로 했고, 기존의 CSR을 재구성한 CSV가 새롭게 등장했다. 코즈마케팅은 CSV를 구현하는 가장 효과적인 방법론으로 기업의 경제활동을 공익에 연결하는 공유가치창출 관점의 마케팅 전략을 의미한다. 본 연구는 이러한 코즈마케팅 전략유형 분류 및 유형별 특성분석에 기반한 전략적 시사점을 제공하는 데 연구의 목적을 두었다. 이에 선행연구를 통한 코즈마케팅 범주의 유형화 및 사례분석, 전문가 참여를 통한 유형분류 및 특성평가를 진행하였다. 연구결과, 9개 사례의 단일유형과 3개의 사례의 복합유형이 분류되었으며, 코즈마케팅의 5가지 핵심속성을 척도화한 평가특성에서는 전 유형에 걸쳐 진정성, 적합성, 지속가능성이 높게 분포했다. 구매연계형과 고객참여형은 혁신성이 낮게 나타난 반면, 관계개선형과 고객선택형은 혁신성의 유의미성이 강조되었다. 상징성은 참여가 용이한 구매연계형과 고객선택형에서 높게 나타났으며, 고객선택형은 모든 특성이 전반적으로 높게 나타나 전략유형으로서의 안정성과 유연성을 확인할 수 있었다. 전체 특성 중 적합성의 영향력이 가장 높게 나타났는데 이는 기업분야와 코즈의 일치성이 갖는 사회적 수용의 중요성을 강조하는 결과라 할 수 있다. 각각의 전략유형은 코즈마케팅 방식에 따라 각기 다른 특성과 연계 가능성을 잠재하고 있다. 이는 두 가지 이상의 유형 특성이 복합적으로 구성되었을 때 발생될 수 있는 가치총량의 확장성을 방증한다. 이에 본 연구는 복합유형에 대한 전략적 효과성을 견지하며 코즈마케팅 특성효과의 기초를 제시하는 연구의 의의를 갖고자 한다. As ethical consumption expands into a social phenomenon, ethical management is being emphasized more. Companies needed new response strategies to accommodate these social needs and to pursue private interests, a new CSV has emerged that reconstructed the CSR. Cause marketing is the most effective methodology for implementing CSV and refers to a marketing strategy in terms of creating shared value that links the economic activities to the public interest. This study aims to provide strategic implications based on this strategy type of cause marketing classification and type specific characteristic analysis. Accordingly, the typification and case study of cause marketing categories were carried out through prior research, and type classification and characteristic evaluation were conducted through expert participation. As a result, 9 cases of single type and 3 cases of complex type were classified, in the evaluation characteristics that scaled the 5 core attributes of cause marketing, authenticity, fit, and sustainability were highly distributed across all types. Purchase linked and customer participation types showed low innovation, while the relationship improvement and customer selection types emphasized the significance of innovation. Symbolism was high in purchase linked and customer selection types that were easy to participate, and customer selection type showed high overall characteristics, confirming stability and flexibility as a strategic type. The effect of fit was the highest among characteristics, which means the importance of the consistency between the business field and the cause. Each strategy type has different characteristics and potential for connection. This demonstrates the scalability of the total value that can occur when two or more characteristics of type are combined. Hope this study to be the beginning of research on cause marketing characteristic effects.

      • MDCT를 이용한 Head Angiography검사 시 Contrast Volume 감소에 관한 연구

        김정훈(Jeong hoon Kim), 정재현(Je Hyeon Jeong), 김기홍(Ki Hong Kim) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        Purpose This study is to evaluate an effect on quality of angiographic image, when the contrast volume is reduced in head angiography by MDCT Materials and methods Total forty patients have been examined a head angiography by MDCT. Twenty patients (A group) of forty patients have been examined with contrast madia with 100ml, the other twenty patients (B group) have been examined with contrast madia with 60ml and normal saline with 40 ml. Speed of injection by auto injector was 4-5cc per Second. Dual source CT(Definition, Siemens, Erlangen, Germany) and dual auto injector (Optivantage, TYCO) were used for this study. The obtained images were reconstructed three dimension, and then that was visually evaluated by three radiological technologists. A value of CT number (Hounsfield Unit) was measured on three portion including internal carotid artery (ICA), M1 of middle cerebral aitery (MCA), Basal Artery (BA). Results In the visual evaluation, the average score of A group was 2.43±0.45, and B group was 2.40±0.44. In the value of CT number, ICA, M1 of MCA, and BA A group were 441.99±65.26, 242.84±41.72, and 331.42±58.07, respectively. B group were 413.78±51.03, 229.16±32.33, and 305.13±67.26, respectively. Conclusion When testing used quantity of the contrast media that is reduced 40%, we could know that It don't effect the image quality, and we basically think of dangerous element about increasing a side effect of the contrast media with developing CT test. If we can reduce the amount of the using without decreasing the image quality, the study will develop more safe ai1d reliably.

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